Health Library Explorer
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A-Z Listings Contact Us
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Click a letter to see a list of conditions beginning with that letter.
Click 'Topic Index' to return to the index for the current topic.
Click 'Library Index' to return to the listing of all topics.

Multiple Chemical Sensitivity (Idiopathic Environmental Intolerance)

It is known that chemicals cause many human diseases. Some of the chemicals that have been shown to be dangerous to people include:

  • Tobacco smoke. This is the major cause of lung cancer.

  • Asbestos. This causes mesothelioma. This is an aggressive cancer that develops in the linings of the lungs, heart, or abdomen. This also causes lung cancer, asbestosis, and an increased risk for gastrointestinal cancer.

  • Kepone. This is an insecticide that can cause infertility in people assigned male at birth. It also causes neurological disorders and kidney and liver damage.

  • Dibromochloropropane. This is a pesticide that can cause infertility in people assigned male at birth. It may contribute to certain cancers.

Exposure to some chemicals may cause symptoms like an allergic reaction. This includes synthetic and natural substances found in:

  • Carpeting

  • Plastics

  • Perfumes

  • Plants

  • Paint

  • Cigarette smoke

There are many other chemicals under review. The problem continues to grow because more types of chemicals are made over time.

What is multiple chemical sensitivity?

While some chemicals are known to cause problems, some people are sensitive to a wide range of substances. This is known as multiple chemical sensitivity. It is also called idiopathic environmental intolerance (IEI).

Multiple chemical sensitivity, or IEI, is under debate in the medical field at this time. Some healthcare providers question if the underlying illness is not medical but psychiatric. They suggest that the symptoms are caused by anxiety. Others say it is a medical disorder triggered by exposure to chemicals, electromagnetic forces, or other substances in the environment. Symptoms often begin with a short-term, severe chemical exposure, such as a chemical spill. Or they may happen after exposure over time.

After this, low levels of chemicals found in everyday materials can trigger physical symptoms in people with multiple chemical sensitivity. This includes chemicals in soaps, detergents, cosmetics, and newspaper inks.

What are the symptoms of multiple chemical sensitivity?

Below are the most common symptoms. But each person's symptoms can vary. Symptoms may include:

  • Headaches

  • Rashes

  • Asthma

  • Muscle and joint aches

  • Fatigue

  • Memory loss

  • Confusion

Is this a recognized clinical diagnosis?

At this time, multiple chemical sensitivity, or IEI, is a diagnosis under debate. Some in the medical field lean toward the symptoms being physical signs of psychiatric illness. This means they think it’s not a primary medical illness. Others in the medical field and some organizations agree these are physical reactions to substances. There is ongoing review about this condition as a clinical diagnosis. Multiple chemical sensitivity shares symptoms with other chronic conditions that are poorly understood, including fibromyalgia and chronic fatigue syndrome. Talk with your healthcare provider to learn more.

Online Medical Reviewer: Robert Hurd MD
Online Medical Reviewer: Stacey Wojcik MBA BSN RN
Online Medical Reviewer: Tennille Dozier RN BSN RDMS
Date Last Reviewed: 7/1/2023
© 2000-2024 The StayWell Company, LLC. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.
CareFirst Resources

CareFirst BlueCross BlueShield is the shared business name of CareFirst of Maryland, Inc. and Group Hospitalization and Medical Services, Inc., which are independent licensees of the Blue Cross and Blue Shield Association. BLUE CROSS®, BLUE SHIELD® and the Cross and Shield Symbols are registered service marks of the Blue Cross and Blue Shield Association, an association of independent Blue Cross and Blue Shield Plans.
Powered by StayWell